Velas Village, Ratnagiri: For Velas Turtle Festival
Goa: For the vibrant Shigmo Festival
Lakshadweep: For the soothing climate
Havelock Island, Andaman: Experience the marine life
Rameshwaram: Pleasant climate and gorgeous beaches
Ooty: For The Scenic Beauty
Chikmagalur: For peace and beauty
Wayanad: Perfect time for hiking
Mount Abu: For the traditional Gangaur Festival
Jaipur: For the Elephant Festival
Hi Anshul, Solo trip in March is definitely a great idea and the list of destinations are different from one another as well. Jaisalmer is the best option as far as I think. The weather is pleasant, the high travel season is passed it will be moderate on your budget as well. Jaisalmer will give you the option of Sam Sand Dunes and not get roast in the sun as well. In terms of food, Rajasthan is always a great option apart from any other state. Sikkim will be a bit cooler in March. Lachung a mountain area near Gangtok will be still covered in snow around the dates you have specified. Personally i will not suggest Kerala as the temperature is bit on a higher side like 33-35 degree Celsius and you wont be able to enjoy as much. Plus it would be little higher side on the budget as well
Yaa! hii.. it's Hemant, first of all travelling solo in an amazing and adventurous experience.. doesn't matter where you travel but when you travel solo you gotta learn a lot of things. now coming back to your question, my friend you can definitely visit jaisalmer in summer coz that's the great time to visit there.
I think you'll have a gala time in Sikkim. If you're lucky enough, you can witness snowfall in North or East Sikkim. As spring approaches the Yumthung Valley aka Valley of Flowers at this time, you'll find the area covered with poppies, iris, primulas, rhododendrons and other flora.